#!/bin/sh
#basic
a <b c>>d>e;f|g
cd x
exit
logout
#versatile
#ls&ps
#jobs
#nice
#wait 23
#advanced
#aa&&bb||c
#a|(b;c)
#echo $HOME
#echo a*b?[a-z]
#a=b
##scripting
#cat <<#here
#document
#here
#`pwd`
#case $a in
#a)	echo bb ;;
#b)	echo aa ;;
#esac
#if [ a -eq b ] ; then aaa ; else ppp ; fi
#while [ a ] ; do .... ; done
#bash
#$(xxx ppp)
